Three's device portfolio manager Brendan Arndt has shared the company's top five tech predictions based on the pace of change over the last four decades:

1. If network innovations continue at the current rate, 4G will be a distant memory and we'll be well on the way towards lightning fast 14G.

2. Three has found that monthly data use amongst its customer base is doubling year on year. If monthly data use continues to grow at this same rate, people will be using nearly 100m exabytes of data each month.

3. Will smartphones be replaced by smart contact lenses? Sounds far-fetched but scientists at the University of Washington are working on solar-powered contact lenses with transparent LEDs embedded onto the lens which could transmit data right in front of the wearer's eyes.

4. If the smartphone does stick around, then it's likely that contactless no-touch interfaces will have taken off. In the way that Kinect has taken the gaming industry by storm, if this is applied to telecommunications the possibilities are endless.

5. Many of the big tech companies are making strides towards contactless payment technology using NFC... it's expected and very likely that this will be the norm 40 years from now, eliminating the need for cash in any stores.

What do you think about Three's predictions for the future of the mobile phone? Where do you see the future of cellular phones?